Woman portrait art. Which technique is used for this Painting

Portrait painting is a genre in painting, where the intent is to represent a specific human subject. The term 'portrait painting' can also describe the actual painted portrait. Portraitists may create their work by commission, for public and private persons, or they may be inspired by admiration or affection for the subject. Portraits often serve as important state and family records, as well as remembrances.

Historically, portrait paintings have primarily memorialized the rich and powerful. Over time, however, it became more common for middle-class patrons to commission portraits of their families and colleagues. Today, portrait paintings are still commissioned by governments, corporations, groups, clubs, and individuals. In addition to painting, portraits can also be made in other media such as prints (including etching and lithography), photography, video and digital media.

Frans Hals, later finished by Pieter Codde. De Magere Compagnie. 1637. Oil on canvas, 209 x 429 cm. Group portraits were important in Dutch Golden Age painting
It might seem obvious that a painted portrait is intended to achieve a likeness of the sitter that is recognisable to those who have seen them, and ideally is a very good record of their appearance. In fact this concept has been slow to grow, and it took centuries for artists in different traditions to acquire the distinct skills for painting a good likeness.